[wintab] Expand whitelist of tablets

[Dan Kegel]

Accept two more known tablet names, and also
the generic word tablet, as clues that a particular
input device is in fact a tablet.
Untested (and I don't quite know why "eraser" was
in the existing whitelist), but might fix several regressions:
http://bugs.winehq.org/show_bug.cgi?id=11699
http://bugs.winehq.org/show_bug.cgi?id=12005
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